remove old logging for stopped messages

[panentheos]

Summary of changes

This removes some old logging of "stopped" messages, which presumably hasn't been looked at for some time. If we want this information today, we could easily parse the update logs.

[github-actions]

Coverage of commit 7cdad81

Summary coverage rate:
  lines......: 76.6% (1892 of 2469 lines)
  functions..: 77.5% (517 of 667 functions)
  branches...: no data found

Files changed coverage rate:
                                                             |Lines       |Functions  |Branches    
  Filename                                                   |Rate     Num|Rate    Num|Rate     Num
  =================================================================================================
  lib/signs/utilities/updater.ex                             | 100%     11| 100%     1|    -      0

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